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Lady Gaga encourages fans to pay tribute on 9/11

Lady Gaga and Nas have filmed a Public Service Announcement (PSA) urging fans to pay tribute to the victims of the 9/11 terrorist attacks on the 10th anniversary of the tragedy this weekend (11Sep11).

The Poker Face hitmaker and the hip-hop star feature in the 9/11 Tribute Movement clip, which asks devotees, "10 Years Later, what will you do to remember?"

Bosses behind the campaign at 911day.org aim to make the anniversary on Sunday (11Sep11) "the single largest day of charitable service in United States history".

In the video clip, Gaga recalls, "We were in disbelief, we all watched the second tower (of the World Trade Center) fall together."

Nas adds, "Nobody was prepared for 9/11, what happened (sic). I will remember the people that were lost."

Other stars including professional dancer Julianne Hough and reality TV star Pauly D also appear in the PSA.